Just by one click. Safe, fast and sure first
Locked device : 
One button in CM2MTK Module : 
Code:
Operation : Format FileSystem [ v1.32 ]
1. Power Off Phone , Remove battery , Insert back
2. Insert USB cable. In some cases require hold BootKey
Wait for phone...
Phone found! [ 11 ]
Sync...
Inital regs read done
Boot Info :
BB_CPU_ID : 6735
BB_CPU_HW : CA00
BB_CPU_SW : 8A00
BB_CPU_SB : 0000
BB_CPU_NM : [MediaTek] MT6735_S00
Processing BROM stage
SecCfgVal : 0x00000000
BromVersion : 0xFF
BLVersion : 0x01
Preloader Status : Alive
Processing DA stage
DA Select done , sending
DA Ver : MTK_AllInOne_DA_v7.1533.03
NAND_ID : 00000000000000000000000000000000
eMMC_ID : 510001154D5332373F240042B399676A
DA Stat : v4.2 on BBID : 0x93
DA Sent. Configure setting now ...
DA started successuflly
eMMC FlashIC initialized
[eMMC] : FLASH_VEN : 0015 , OEM : 0100
[eMMC] : FLASH_INF : BMS27
[eMMC] : FLASH_CID : 150100513732534D4200243F6A6762B3
[eMMC] : FLASH_EXT : 00400000/00080000
[eMMC] : FLASH_LEN : 0x00000001D2000000
INT RAM : 0x00020000
EXT RAM : 0x40000000
BOOT TYPE : EMMC_FLASH_BOOT
SOC VERIFY : C1
Boot Ok!
Clear Google Reset Protecton
Clear Ok!
Clear DIN
Clear Ok!
Clear USERDATA
Clear Ok!
Clear CACHE
Clear Ok!
Done!
Elapsed: 00:00:25
Reconnect Power/Cable!
And the result : 
"trully for china" and "ahead off all" with rest - try at least come to our level